We have a 2015 Quick Turn Universal 250M with a Mazatrol Smart control. For the last few years, we have been struggling with a persistent I/O 55 error during tool changes. Mazak service has been unable to fix this, as well as an outside Mazak service company has been unsuccessful. Mazak's only recourse is to try to sell us a replacement machine, but since we feel it is not that old and still runs 75% of the time without a problem, we would rather still try to fix the problem. We feel it may be temperature related, but we have done everything, even pumping cool air into the main electrical box on the machine, to no avail. Anyone else have this same issue and a fix? Any thoughts on this would be appreciated. Thank you.